温室辣椒、黄瓜瓜蓟马种群动态调查及田间药剂防控OA

This study examined the temporal population dynamics and spatial distribution of Thrips palmi on greenhouse-grown peppers(screw pepper and chili pepper)and cucumbers in 2024,and evaluated the field control efficacy of three insecticides.The results showed that from January to April,the population density of T.palmi on peppers gradually increased with rising temperature and was significantly correlated with temperature and humidity.The population density on chili pepper reached a peak of 16.4 individuals per plant,which was higher than that on screw pepper(maximum 7.8 individuals per plant).From June to August,the population density of T.palmi on cucumbers increased initially and then declined,with a peak of 106.8 individuals per plant,and showed no significant correlation with temperature or humidity during this period.Blue sticky traps placed on the northern side of the greenhouse captured the highest number of T.palmi,with an average of 322.3 individuals per trap,whereas yellow sticky traps placed in the central area captured an average of 4.2 individuals per trap.Overall,blue traps attracted significantly more thrips than yellow traps.Seven days after application,broflanilide 10％SC showed control efficacy of 90.33％on screw pepper and 84.20％on cucumber.The control efficacy decreased with increasing pest population density:the initial pest density on chili pepper was higher than that on screw pepper,resulting in lower control efficacy,and the pest population density before the second pesticide application on cucumber was higher than that before the first application,leading to reduced control efficacy.For effective greenhouse management of T.palmi,blue sticky traps should be uniformly installed for monitoring and mass trapping before temperature increases.The optimal control efficacy of broflanilide 10％SC application was achieved when the pest density reached 3-5 individuals per plant in pepper greenhouses and 2 individuals per plant in cucumber greenhouses.This study provides valuable technical support for the scientific control and integrated management of T.palmi in greenhouse production systems.